JP2004023895A - Automatic synchronizer monitoring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic synchronizer monitoring system which monitors synchronously applying timing of a generator to a power system, which can early discover an aging mistake and which facilitates data processing at an inspecting time. <P>SOLUTION: The automatic synchronizer monitoring system synthesizes a system voltage V<SB>L</SB>and a generator voltage V<SB>G</SB>, inputs a beat voltage corresponding to their phase difference, and calculates a phase angle from the input value by a phase angle calculating means 19. The system also latches the phase angle calculated by the phase angle calculating means 19 by phase angle extracting means 20, 21, respectively when an input command signal #25B to a generator breaker and an input signal #52G-ONX of the same breaker are input, and extracts them as an input command time phase angle ▵θ1 and an input time phase angle ▵θ2. The system determines whether the input time phase angle falls within an allowed value or not by a determining means 27, and outputs an alarm signal if the input time phase angle is out of the allowed value. Further, the system measures a time from the input command signal inputting time of the generator breaker to the input signal inputting time as an advancing time T by an advancing time measuring means 30. A behavior of each part when the generator is input in the power system can be instantaneously grasped and analyzed. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a monitoring system for an automatic synchronizer that turns on a generator circuit breaker at a timing when the phases of the power system and the generator are synchronized when the generator is inserted into the power system in parallel (hereinafter, referred to as parallel insertion). .
[0002]
[Prior art]
In general, when a generator is inserted in a power system, even if there is any voltage difference, frequency difference, or phase difference between the two, the generator will be shaken at the time of insertion, and in the worst case, it will go out of synchronization or the equipment May cause damage. For this reason, an automatic synchronizer that automatically satisfies these three conditions and performs parallel insertion is used.
[0003]
Here, the description will be given focusing on the phase. When the parallel insertion is performed as described above, the automatic synchronizer issues an input command so that the generator circuit breaker is input at a timing when the phases of the power system and the generator are synchronized. In this case, the generator breaker used for parallel insertion requires a certain period of time (referred to as closing time) from when the closing command is given to when the contacts are closed. For this reason, it is necessary to output an injection command at a time (advance time) advanced by the input time from a true input timing at which the phases of the power system and the generator are synchronized.
[0004]
Although the automatic synchronizer initially sets this advance time accurately, long-term use may cause aging errors. If the aging error causes a shift in the injection timing, the shock at the time of parallel insertion increases, and in the worst case, the equipment may be damaged as described above. Therefore, it is necessary to detect this aging error early.
[0005]
Conventionally, such an aging error has been detected by recording data of an automatic synchronizer. In order to record data of the automatic synchronizer, for example, a circuit configuration as shown in FIG. 2 was required. That is, as shown in FIG. 2, an optical recorder (such as a visit graph) 1 was used, and a resistor BOX 2 and an AC voltmeter 3 were connected to the input side. As shown in FIG. 3, the recorder 1 converts the beat voltage waveform, the synchronization input permission signal # 25A of the automatic synchronizer, the input command signal # 25B, and the generator cutoff signal 52G-ONX signal waveform. Record each.
[0006]
In such a conventional apparatus, the measuring devices 1, 2, and 3 must be connected by a measuring wire in the inspection work, and the recorder 1 and the resistance BOX 2 must be calibrated by provisional input in advance. Preparation was troublesome and took a lot of time.
[0007]
In addition, after recording the data as shown in FIG. 3, in order to extract necessary data from these data, that is, the phase difference angle Δθ and the injection time T, it is necessary to manually measure and calculate using a ruler. No. For this reason, it takes time to read the data, and an error occurs. Also, since the determination cannot be made instantaneously, it cannot be used for monitoring. Further, when adjusting the advance time, such recording must be repeatedly performed, so that it takes too much time for data measurement.
[0008]
[Problems to be solved by the invention]
As described above, in the related art, it takes time to prepare for inspection, it takes time to read data after inspection, and there is a possibility that an error may occur. In addition, since the determination cannot be performed instantaneously, it cannot be used for monitoring. Further, there is a problem that it takes too much time for data measurement at the time of important advance time adjustment.
[0009]
SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic synchronizer monitoring system capable of monitoring the timing of synchronizing a generator into a power system, detecting an aging error at an early stage, and facilitating data processing during inspection.
[0010]
[Means for Solving the Problems]
The present invention is a monitoring system for an automatic synchronizer that turns on a generator circuit breaker at the timing when the phase of the system and the generator is synchronized when the generator is inserted into the system, and synthesizes the system voltage and the generator voltage. Input a beat voltage, calculate a phase angle from the value, and input a turn-on command signal to the generator breaker and a turn-on signal of the breaker. Phase angle calculating means for respectively latching the phase angles calculated by the phase angle calculating means, and extracting the latched phase angles as a closing command phase angle and a closing phase angle, respectively, and the closing phase angle is within an allowable value. A judgment means for judging whether the value is outside the allowable value and outputting an alarm signal, and a forward time measurement for measuring a time from the input command signal input time to the input signal input time of the generator breaker. Characterized by comprising a stage.
[0011]
In the present invention, the phase angle calculated from the beat voltage, the input command signal and the input signal of the generator breaker, the input command phase angle and the input phase angle, and data relating to the advance time are respectively input, and each of these input data May be provided with a data processing means for performing waveform processing or numerical processing and storing or outputting the result.
[0012]
Further, in the present invention, a personal computer for inputting various data output from the data processing means may be provided.
[0013]
In these inventions, a system voltage and a generator voltage are combined, a beat voltage corresponding to a phase difference between them is input, and a phase angle is calculated from the value by a phase angle detection calculation unit every moment. Also, at the time when the closing command signal to the generator breaker and the closing signal of the breaker are input, respectively, the phase angle calculated by the phase angle detection calculating means is latched by the phase angle extracting means, and these are latched. The phase angle is extracted as the time phase angle and the phase angle at the time of closing. Then, the determining means determines whether or not the closing phase angle is within the allowable value, and outputs an alarm signal if the phase angle is out of the allowable value. Further, the forward time measuring means measures the time from the input command signal input time of the generator breaker to the input signal input time as the advance time. From the obtained values, the behavior of each part when the generator is put into the power system can be instantaneously grasped and analyzed.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of an automatic synchronizer monitoring system according to the present invention will be described with reference to the drawings.
[0015]
In FIG. 1, reference numeral 11 denotes an automatic synchronizer monitoring system, and low-pass filters 12, 13, and 14 are provided in a voltage input unit thereof. The system voltage _VL is input to the input side of the low-pass filter 12 via the lines R _L and S. An A / D converter 15 and a digital display 16 are connected to the output side. Also, the input side of the low-pass filter 13, the generator voltage _{V G} is input lines _R G, the S. An A / D converter 17 and a digital display 18 are connected to the output side.
[0016]
A beat voltage is input to the input side of the low-pass filter 14 through the lines _RG and _RL . A beat voltage, as is well known, a composite of the the system voltage V _L of the power system to be parallel target and the voltage V _G of the generator, as shown in FIG. 3, the envelope corresponding to their phase difference To form Further, the output side is connected to the phase angle calculation means 19.
[0017]
Calculating the phase angle calculating means 19 receives a beat voltage through a low-pass filter 14, on the basis of the beat voltage, momentarily a phase angle corresponding to the phase difference between the system voltage V _L and the generator voltage V _G I do. To the output side of the phase angle calculating means 19, latch circuits 20 and 21 constituting the phase angle extracting means are respectively connected.
[0018]
The latch timing terminal of one of the latch circuits 20 is connected to a contact input circuit 22, and an automatic synchronizing device (not shown) supplies a command to turn on the system breaker for system in-line through the contact input circuit 22. # 25B is input. Therefore, the phase angle Δθ1 at the time of the command to turn on the generator breaker is output to the output side of the latch circuit 20 and displayed on the digital display 23 connected to this output side.
[0019]
In addition, from a not-shown automatic synchronizer, a closing permission signal # 25A of the generator breaker for system in-line is also input to the contact input circuit 24.
[0020]
Further, the latch timing terminal of the other latch circuit 21 is connected to a contact input circuit 25, and through this contact input circuit 25, a closing signal of a generator circuit breaker (a signal generated by a circuit breaker contact closing) # 52G- ONX is input. Accordingly, the phase angle Δθ2 when the generator circuit breaker is turned on is output to the output side of the latch circuit 21 and displayed on the digital display 26 connected to this output side.
[0021]
The output side of the latch circuit 21 is also connected to the closing phase angle determination circuit 27. The closing phase angle determination circuit 27 determines whether the closing phase angle Δθ2 latched by the latch circuit 21 is within an allowable value. On the output side of the closing phase angle determination circuit 27, a determination display 28 and an alarm output circuit 29 are respectively connected.
[0022]
Reference numeral 30 denotes advance time measuring means. One input terminal is connected to the contact input circuit 22 for the circuit breaker closing command signal # 25B, and the other input terminal is connected to the contact input circuit 25 for the circuit breaker closing signal # 52G-ONX. Have been. A so-called timer is used as the forward time measuring means 27, and measures a time (forward time) T from the time when the input signal # 25B is input to the generator breaker to the time when the input signal # 52G-ONX is input.
[0023]
The output side of the forward time measuring means 30 is connected to the digital display 31 and the data processing means 32, respectively, and outputs the measured value of the forward time T to them.
[0024]
The input side of the data processing means 32 is connected to the output side of each of the contact input circuits 22, 24, 25, the output side of each of the latch circuits 20, 21 and the output side of the phase angle calculating means 19 in addition to the forward time measuring means 30. Each is connected. Then, the phase angle calculated from the beat voltage, the input signal of the generator breaker, the input command signal and the input signal, the input command phase angle and the input phase angle, and the advance time are respectively inputted. Waveform processing or numerical processing of input data and saves or outputs.
[0025]
The output side of the data processing means 32 is connected to a printer 33 and a personal computer 35 via an external interface circuit 34.
[0026]
In the above configuration, the automatic synchronization device monitoring system 11, power system and voltage of the generator is a parallel target, i.e., V _L, and V _G, which beat voltage is input, respectively. Among them, the generator voltage _{V G} and the system voltage _{V L} after each filtering, converted A / D, its value is displayed by the digital display 16. The difference between the system voltage V _L and the generator voltage V _G This display is confirmed, it is possible to determine whether to use the synchronization device. Further, it is possible to confirm the alignment speed control by an automatic voltage regulator (not shown).
[0027]
On the other hand, after a beat voltage which is filtered, is input to the phase angle calculating means 19, the phase angle based on the beat voltage, i.e., the phase difference between the generator voltage V _G and the system voltage V _L is momentarily operation.
[0028]
In addition, the automatic synchronizer monitoring system 11 receives, from the automatic synchronizer, a closing permission signal # 25A and a closing command signal # 25B for the generator breaker for parallel insertion, and a closing signal # 52G-ONX of the same breaker. Is entered. Of these, the generator breaker turn-on command signal # 25B is input to the latch circuit 20, and the turn-off signal # 52G-ONX of the breaker is input to the latch circuit 21 as a latch timing signal.
[0029]
For this reason, the latch circuit 20 outputs the phase angle calculated at the point in time when the generator circuit breaker turn-on command signal # 25B is input as the turn-on command-time phase angle Δθ1, and outputs this phase angle Δθ1 to the corresponding digital display 23. Display. Further, the latch circuit 21 outputs the phase angle calculated at the time when the generator breaker turn-on signal # 52G-ONX is input as the turn-on phase angle Δθ2, and displays this phase angle Δθ2 on the corresponding digital display 26. Let it.
[0030]
Further, the closing phase angle Δθ2 is given to the closing phase angle determination means 27, where it is determined whether it is within an allowable value. If the result of the determination is within the allowable value, the determination indicator 28 is lit in green to indicate that the value is within the allowable value. On the other hand, if the value is outside the allowable value, the alarm output circuit 29 outputs an alarm signal to the outside.
[0031]
Since the closing command signal # 25B to the generator circuit breaker and the circuit breaker closing signal # 52G-ONX are input to the forward time measuring means 30, the closing signal # 52G-ONX is input from the time when the closing command signal # 25B is input. The time T (forward time) up to the point of input of is measured. The measured advance time T is displayed on the digital display 31 and input to the data processing means 32.
[0032]
The data processing means 32 stores the input advance time T as previous data. Further, the phase angle output from the phase angle calculation means 19 is also input to the data processing means 32 and is formed as waveform data. The closing command phase angle Δθ1 and the closing phase angle Δθ2 which are latched and extracted by the latch circuits 20 and 21 are respectively stored as previous data by the data processing means 32. Further, the power-on permission signal # 25A, the power-on command signal # 25B, and the power-on signal # 52G-ONX of the generator circuit breaker input from the automatic synchronizer are input to the data processing means 32, and their input timings are stored and processed. You.
[0033]
These various types of data that have been stored, waveform-processed, or numerically processed by the data processing unit 30 can be printed out by the built-in printer 33. In addition, the data can be output to an external personal computer 35 via an interface circuit (GPIB: General Purpose Interface Bus) 34 and stored.
[0034]
Thus, displays the system voltage V _L and the generator voltage V _G of the parallel object, enter their beat voltage, determined every moment by calculating a phase angle corresponding to the phase difference from that value, the calculation result From the above, the phase angle at the time of the generator breaker closing command and the phase angle at the time of closing of the breaker are extracted and displayed, and it is determined whether the phase angle at the closing is within the allowable value. Since the forward time from the time to the closing time is measured and displayed, the inspection and adjustment of the automatic synchronizer can be easily performed.
[0035]
For example, it is necessary to repeatedly adjust the advance time while checking the advance time. Compared to the case where the required data is calculated by measuring the waveform recorded on the conventional recorder with a ruler and the required data is analyzed and analyzed, in the present embodiment, the required data such as the advance time and the phase angle at the time of closing are obtained instantaneously. Since the display or warning is given and the judgment can be made instantaneously, the adjustment work becomes easy and accurate, and the adjustment time can be greatly reduced.
[0036]
Further, since there is no need for manual measurement / analysis work using a ruler, no human error occurs in the data value, and the data is made uniform.
[0037]
Conventionally, a dedicated recorder, a resistance BOX, and an AC voltmeter had to be connected each time before the inspection, and calibration had to be performed in advance. Is unnecessary, so that preparation in advance becomes easy.
[0038]
In addition, as described above, necessary data is obtained instantaneously, and display, judgment, alarm, etc. are performed, so that deviations or changes in characteristics can be found at an early stage. Use to help prevent those accidents.
[0039]
Further, since various data can be printed out or stored in a personal computer, data can be easily arranged and stored, and the space for data can be reduced.
[0040]
【The invention's effect】
According to the present invention, it is possible to monitor the timing of synchronizing the generator with the power system and to detect an aging error of the automatic synchronizer at an early stage, so that a shock at the time of turning on can be prevented, and data processing at the time of inspection is also performed. It will be easier.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of an automatic synchronizer monitoring system according to the present invention.
FIG. 2 is a circuit diagram showing a conventional technique.
FIG. 3 is a waveform diagram for explaining a synchronous input state.
[Explanation of symbols]
11 automatic synchronizer monitoring system 16 generator voltage _{V G} of the display 18 system voltage _{V L} of the display 19 the phase angle calculating means 20, 21 display latch circuit 23 closing command when the phase angle Δθ1 constituting the phase angle extraction unit 26 Indicator of closing phase angle Δθ2 27 Judgment means 30 Advance time measuring means 31 Indicator of advance time T 32 Data processing means

Claims (3)

A monitoring system of an automatic synchronizer that turns on a generator circuit breaker at a timing when the phase of the system and the generator is synchronized when the generator is inserted in the system,
Phase angle calculating means for inputting a beat voltage obtained by combining the system voltage and the generator voltage, and calculating a phase angle from the value;
A closing command signal to the generator breaker and a closing signal of the breaker are input, respectively, and when these signals are input, the phase angles calculated by the phase angle calculating means are latched, respectively. Phase angle extracting means for extracting the closing command time phase angle and closing time phase angle respectively,
Judgment means for judging whether the closing phase angle is within an allowable value and outputting an alarm signal if it is out of the allowable value,
Forward time measuring means for measuring the time from the input command signal input time of the generator breaker to the input signal input time,
An automatic synchronizer monitoring system, comprising: The phase angle calculated from the beat voltage, the input command signal and the input signal of the generator breaker, the input command phase angle and the input phase angle, and each data relating to the advance time are respectively input, and these input data are subjected to waveform processing or 2. The automatic synchronizer monitoring system according to claim 1, further comprising data processing means for performing numerical processing and storing or outputting the numerical data. 3. The automatic synchronizer monitoring system according to claim 2, further comprising a personal computer for inputting various data output from the data processing means.

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